Snow here is normally a holiday but the attitude is everywhere. My wife and are true locals but we live in an area of this nation where much of our population is more and more transplants. One neighbor from Rhode Island, next to them Maryland, behind them locals who are very well off, behind them couple that are world war 2 survivors from Belgium (in poor health) and the neighbor beside basically local widow also in bad health. On my other side local couple with two children they treat me like their granddaddy and an older divorced gentleman also with health issues. Oh yes past those are many others some I know and some know nothing about. Not like when I grew up as we knew everybody. Of all those the older ones have helped more than once with my tractor and glad to do so. No cash but a welcome neighbor job. Nothing major and not ongoing. Wealthy neighbor has no need of my help but if he asked would for we are decent friends. Then I have neighbor who was out of town for couple of weeks and his grass could have used cutting and I skipped it for he able to work spouse to me should have been able to ride the lawn mower and lawn is not large at all. Guess what I am saying is I have done what many here have said, those I think need help, those who help me (ones with small children and I help out each other in little ways right often so two way street, only one who I swap work with) and those who show friendship. Have another couple from New York or New Jersey have done some work for cause they needed it. It was very obvious they appreciated it and have brought us vegetables a few times. They also visit my mother in law from time to time in the Nursing Home which is worth more than all I have done for them. I do find people who have always lived in big cities that move here seem not to "understand" how much we do for ourselves nor truly appreciate it. Now there are always the leaches regardless where you are or from.
But for the OP my suggestion and it may have been made is simple: I would write a letter to each one there and not be rude but simple tell it has been your pleasure to do what you have but the cost for fuel, equipment and time along with liability is making it unaffordable. He may wish to have a dollar amount he is willing to do the work for either per time, per hour or what ever or he may wish to stop. I suspect many of the newer people have no idea why he does the work, they may think he sold the land and made tons and therefore he is doing this or such. Till you ask you don't know and bet their answers will surprise you. Then I would stand by that and stop for anyone other than myself and those you may wish to do for free or if they hire you for their drive or such. Of those I mentioned would help anyone with no expectations of being paid on an occasion. Have offer somewhat joking with the wealthy couple but that was more to prove who could cut grass the fastest, my Ferris or his Husky, lol.